Bakery Style Double Chocolate Chunk Cookies Recipe

Devine Bakery style Double chocolate cookies, with white chocolate and milk chocolate chunks, and a soft and chewy center.
Ingredients:
115g butter
100g granulated sugar
125g light brown sugar
1 medium egg
1 tsp vanilla extract
200g plain flour
20g cocoa powder
1/4 tsp salt
1/2 tsp baking powder
1/2 tsp bicarbonate of soda
100g white chocolate
100g milk chocolate